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Turgay Ertekin, professor of petroleum and natural gas engineering, left, takes a photo with S.M. Farouq Ali during Ertekin's retirement celebration. | by pennstatenews
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Turgay Ertekin, professor of petroleum and natural gas engineering, left, takes a photo with S.M. Farouq Ali during Ertekin's retirement celebration.

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Taken on June 23, 2017